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Re: Hot-blooded marine reptiles
On Tue, Jun 15th, 2010 at 11:42 AM, GSP1954@aol.com wrote:
> Endothermy merely means that the majority of body heat is generated
> internally and does not necessarily imply a high metabolic rate is an
> animal can
> use size and insulation to retain heat despite a reptilian resting
> or is exercising hard and long enough (such as larger sustained
> insects). Endothermy achieved via a normally elevated resting MR is
> tachymetabolism. Some tuna do have elevated resting metabolisms like
> birds and mammals.
Good point. I was taking a rather mammal-centric view of endothermy (which
isn't surprising, since
I happen to be a mammal).
Not all endotherms use the same means as mammals to achieve high body
anything the mammalian condition is more of a fortuitous maladaptation, a bit
anaemia. Our poor old cells have to 'bail' so quickly to offset our ionically
leaky cell membranes
that high body temperatures are a symptom of that genetic 'mistake'. We've just
made the best of
a bad situation.
GIS Specialist Australian Dinosaurs
Melbourne, Australia http://home.alphalink.com.au/~dannj